Topsort is a San Francisco–based AI platform that powers auction-based retail media monetization for global retailers and marketplaces.
<div class="content-intro"><p>We're quickly growing and super excited for you to join us! </p></div><p><strong>About Topsort</strong></p> <p>Topsort is the leading Retail Media Infrastructure company - we're democratizing the auction-based ad technology that was once exclusive to Amazon, Google, and Alibaba, and making it accessible to retailers, marketplaces, and delivery apps in 40+ countries worldwide. Our APIs power native sponsored listings, dynamic banners, and clean-room attribution at scale — all privacy-first, all real-time.</p> <p>We're a fast-growing, global-first team of ~100 people across Boston, Santiago, São Paulo, Barcelona, Sydney, and beyond. We move fast, we build in the open, and we hold a high bar — especially on infrastructure.</p> <p><strong>Why Topsort? Why now?</strong></p> <p>Topsort is changing the way Retail Media works. By joining our scaling team, you'll feel your impact from day 1. The processes and messaging you build today will be a critical part of our foundation as we accelerate toward 200 Topsorters worldwide, and your innovations will leave a lasting mark on the industry, as a whole. Retail Media is on the verge of a new era, and Topsort is gathering the ecosystem together to shape a brighter future. Joining us now, you'll work directly alongside our co-founders and founding members to bring on Retail Media 3.0. If you're looking to define your career as something greater than yourself, come scale with us.</p> <p><strong>What it’s like to work at Topsort</strong></p> <p>Our team is all about straightforward communication, embracing feedback without taking it personally, and fostering a super collaborative environment. It’s a sports team that’s hyper focused on winning, collaborative internally, and competitive externally - never the other way around. </p> <p>We thrive on working in the open, lifting each other up, and getting things done with a sense of urgency. We're the kind of team that loves making bold choices, sharing extraordinary opinions, and maintaining a 100 mph pace. No endless meetings here – if it can be done today, we're all about getting it done today.</p> <p><strong>What is this role like?</strong></p> <p>We're hiring a <strong>Software Engineer for our Infrastructure team</strong> — the backbone of everything Topsort runs on. This is not a supporting role. Infrastructure at Topsort is a first-class, mission-critical function. When our infrastructure is healthy, every retailer and marketplace our customers serve gets fast, reliable, and fair auction results. When it's not, we feel it everywhere.</p> <p>You'll be building and owning the systems that power our real-time auction engine, API platform, and internal developer tooling — at a scale and reliability standard that leaves no room for sloppiness. We need someone who treats production like it matters, because it does.</p> <p><strong>What You'll Do</strong></p> <ul> <li><strong>Own the platform -</strong> Design, build, and maintain the foundational infrastructure that every Topsort product and engineering team depends on, from compute and networking to deployment and observability.</li> <li><strong>Raise reliability - </strong>Define and enforce SLOs, build alerting systems that catch issues before customers do, and lead postmortems that actually prevent recurrence.</li> <li><strong>Make deployments boring - </strong>Build CI/CD pipelines and deployment systems that are so reliable they're invisible. Automate the toil out of every release.</li> <li><strong>Manage infrastructure as code - </strong>Own our cloud infrastructure (AWS/GCP) through Terraform or equivalent — no snowflake servers, no manual configuration drift.</li> <li><strong>Enable developers - </strong>Build internal tooling and platform capabilities that make every Topsort engineer faster, safer, and more autonomous. Your customers are your colleagues.</li> <li><strong>Harden security - </strong>Implement and enforce security best practices at the infrastructure level — secrets management, network policies, RBAC, supply chain integrity.</li> <li><strong>Scale proactively - </strong>Capacity plan, load test, and tune our systems ahead of demand — not in reaction to a page at 2am.</li> <li><strong>Participate in on-call - </strong>We take production seriously. You'll join the on-call rotation and be expected to respond, resolve, and document.</li> </ul> <p><strong>What We Think You Need to Be Successful</strong></p> <p>We’re open to candidates who don’t check every box but show strong potential.</p> <ul> <li>Bachelor's in Computer Science, engineering or a related field from top schools</li> <li>2–5 years of software engineering experience with a meaningful portion focused on infrastructure, platform, or SRE work</li> <li>Solid hands-on experience with Kubernetes in production — not a homelab, not a tutorial, but real clusters under real load</li> <li>Experience with at least one major cloud provider (AWS preferred) and infrastructure-as-code (Terraform or similar)</li> <li>Strong fundamentals in distributed systems — you understand CAP theorem, eventual consistency, and failure modes before they happen</li> <li>Experience building or maintaining CI/CD pipelines (GitHub Actions, ArgoCD, or similar)</li> <li>Comfort with observability tooling — metrics, logs, traces — and the discipline to use them proactively</li> <li>A security-conscious mindset: you think about blast radius, principle of least privilege, and secrets rotation without being asked</li> </ul> <p><strong>You'll stand out if you have:</strong></p> <ul> <li>Experience in high-throughput, low-latency systems (ad tech, fintech, real-time bidding, or similar)</li> <li>Familiarity with service mesh, eBPF, or advanced Kubernetes networking</li> <li>Experience with database infrastructure and data streaming</li> <li>A track record of improving developer experience and reducing time-to-deploy</li> <li>Experience at a high-growth startup where infra had to